Binary Sludge (Page 2)

React.js Conf 2016

The videos are available from React.js Conf 2016. Highlights include: 1. React.js Conf 2016 - Nick Schrock - Keynote - where React and React Native have been, where they are, and where they are going in the future. 2. React.js Conf 2016 - Ben Alpert - What Lies Ahead - In the last

Velocity Conference Santa Clara 2015

More videos, this time from Velocity Conference Santa Clara 2015. Amongst the freebies: * Engineering for the long game: Managing complexity in distributed systems - Astrid Atkinson (Google) * HTTP server metadata/status pages * exponential backoff with jitter to avoid lockstep bugs * deploy to production early and often * don't let the

Docker

Post-systemd.conf Fest - videos and slides

As Lennart Poettering of systemd fame put it: Last week our first systemd.conf conference took place at betahaus, in Berlin, Germany. With almost 100 attendees, a dense schedule of 23 high-quality talks stuffed into a single track on just two days, a productive hackfest and numerous consumed Club-

docker

Monitoring a Host from Inside a Container

The Docker philosophy of isolation can be circumvented by mounting host directories into the container (as Datadog client does, for example) or running a container in --privileged container mode (or --share-system for systemd-nspawn). This prevents pid/network/ipc/disk/uts namespacing (or just pid/uts/ipc for nspawn)

Docker

Docker 1.9

x-posted from: blog.yld.io/2015/11/11/docker-1-9/ With the advent of Docker 1.9 comes a number of ecosystem milestones. The team has now released production-ready Swarm (to orchestrate container deployment) and multi-host networking (to facilitate communication between containers, even as they move

Awesome List of Awesome Things

A reminder that a good place to start when learning a new skill is the curated list of awesome lists. It currently contiains: * Platforms * Programming Languages * Front-end Development * Back-end Development * Computer Science * Big Data * Theory * Books * Editors * Gaming * Developer Environment * Entertainment * Databases * Resources * Learn * Security * Miscellaneous

bash

BASH Subshell Gotchas

It's always helpful to remember that not all BASH operations are created equal. In dicing with configuring an environment I failed to recall the first rule of BASH scripting: Know Your Subshells! In this exampe n is always 0. This is because the increment operation is in a

CloudFlare whacks me in with the porn sites

A validation of CloudFlare's free one-click Flexible SSL service reveals some unsavoury neighbours on the shared certificate they alot to this site. From sslshopper: Common name: sni29282.cloudflaressl.com SANs: sni29282.cloudflaressl.com, *.askporno.com, *.binarysludge.com, *.dzej.eu, *.grem.eu, *.hmtransportation.com, *.joowaal.com, *.kuwaitinfo.info,

linux

Container Camp San Francisco 2015

Container Camp was a roaring success: the speakers were fantastic and varied, the vaudevillian venue was gorgeous, and the Brandsmith.io team hosted the event consummately. The videos are now available, with particular highlights being: * Introduction to swarm - Andrea Luzzardi and Victor Vieux * Container clusters with Kubernetes - Tim Hockin * Building

software engineering

Imprecise But Useful Approximation: Making Fermi Estimates

Just before the Trinity test, Enrico Fermi decided he wanted a rough estimate of the blast's power before the diagnostic data came in. So he dropped some pieces of paper from his hand as the blast wave passed him, and used this to estimate that the blast was

docker

Docker error: INFO[0001] unexpected end of JSON input

Using docker version 1.4.1, build 5bc2ff8-dirty on CoreOS 557.2.0 in EC2 # docker build . Sending build context to Docker daemon 181 MB Sending build context to Docker daemon Step 0 : FROM fedora INFO[0001] unexpected end of JSON input This error betrays filesystem corruption, and probably

Unforeseen Dangers of the Leap Second

A sufficiently-advanced warning of the dangers of time-based programming appears in this month's Availability Digest: There is a reason that there will be no space launches on June 30 or July 1, 2015. Scientists do not want to risk a computer malfunction due to a leap

linux

Validate sshd changes without restarting the daemon

The -t flag tests a configuration file without restarting the sshd daemon. This is helpful if you are ssh-ed into a server and need to change the sshd_config file before updating your configuration management scripts - an error may prevent your server from accepting your next ssh session, or

linux

Video: Building and Testing Docker Containers

Here's the video from my talk at Docker London, January 2014: Building and Testing Docker Containers. Thanks again to the organisers and attendees.

linux

Validate a CoreOS cloud-config file

The coreos-cloudinit binary is CoreOS-specific, so this can only be done from a CoreOS host: $ coreos-cloudinit -validate --from-file /tmp/cloud-config After the system has been instaled, the cloud-config file is written to /var/lib/coreos-install/user_data: $ sudo cat /var/lib/coreos-install/

Programming

Cool (and sometimes) hidden features of Git and GitHub

This repo has so much good stuff. Some favourites: Adding ?w=1 to any diff URL will remove any changes only in whitespace, enabling you to see only that code that has changed. To view all commits on a repo by author add ?author={user} to the URL. https://github.

CoreOS

Docker Image Specification v1.0.0

The spec begins like so: An Image is an ordered collection of root filesystem changes and the corresponding execution parameters for use within a container runtime. This specification outlines the format of these filesystem changes and corresponding parameters and describes how to create and use them for use with a

linux

Install and configure locate (mlocate) on CoreOS

The locate package is useful for getting acquianted with a filesystem. As usual, the easiest way to achieve this on CoreOS is via toolbox (instructions for using the default Fedora image): $ toolbox $ yum install -ty mlocate locate ignores the /media mount point by default. These commands will update the /etc/

Javascript

How to uninstall io.js (or io.js and Node.js together)

io.js is a spork (hoping to merge back into main-line) of Node.js (or "io.js is an npm compatible platform originally based on node.js™). It can be downloaded and installed from their website. I'm currently running v1.0.1. It updates node to

talk

Talk: Building and Testing Docker Containers

I had the pleasure of speaking at Docker London last night. The meetup was as busy as I've seen Shoreditch Works and the other talks were great. The slides are also available here.

Clean Code

What makes a clean test?

What makes a clean test? Three things. Readability, readability, and readability. Readability is perhaps even more important in unit tests than it is in production code. What makes tests readable? The same thing that makes all code readable: clarity, simplicity, and density of expression. In a test you want to

7+1 Myths of the New OS

From Alexis Richardson's talk at operatingsystems.io on 25 November 2014 - 7+1 new myths for New OS: 1. The application lifecycle is independent of the OS 2. Distributed systems require a panoply of new skills and tools. 3. Apps must be fundamentally rewritten, and tooling replaced. 4.

The Seven Deadly Sins of Microservices

Tareq Abedrabbo of OpenCredo delivered this talk at The London PaaS User Group (LOPUG) November 2014. Here are the immortal sins (the accompanying pictures on the slides are worthy viewing here, although there's no further expansion on this text): 1. The Enterprise-OSGI-Application-Service-Bus Building the

Brendan Gregg - Performance Engineering and the USE Method

Brendan Gregg, all-round performance guru and Netflix Performance Engineer, has a slide deck from AWS:Invent on profiling and performance tuning EC2 Instances. Performance Tuning EC2 Instances from Brendan Gregg He also references and links to the Utilization Saturation and Errors (USE) Method: The USE Method provides a strategy

System Administration

Install BASH completion on CoreOS

Updated 12/1/15: add btrfs completions from debian.org Updated 18/6/15: update toolbox/Fedora package manager commands from yum to dnf, remove defunct btrfs completions It's easy really, use toolbox to install then copy the files into the host: $ toolbox dnf -y install bash-completion